MUL-650 - Multimeter Steren - Free user manual and instructions

Product Type	Bluetooth Professional Multimeter
Brand	Steren
Model	MUL-650
Power Supply	9V battery (not included)
Display	LCD with backlight and auto-on in low light
DC Voltage	400mV, 4V, 40V, 400V (±0.5%+2d), 1000V (±0.8%+2d)
AC Voltage (True RMS)	400mV, 4V, 40V, 400V (±0.8%+3d), 750V (±1.2%+3d)
DC Current	400µA, 4000µA, 40mA, 400mA (±1.2%+2d), 4A, 20A (±2%+3d)
AC Current	400µA, 4000µA, 40mA, 400mA (±1.5%+3d), 4A, 20A (±2.5%+5d)
Resistance	400Ω (±1%+3d), 4kΩ/40kΩ/400kΩ/4MΩ (±1%+2d), 40MΩ (±1.5%+3d)
Capacitance	51.2nF (±3%+10d), 512nF/5.12µF/51.2µF (±2.5%+5d), 100µF (±5%+10d)
Frequency	5.12Hz to 5.12MHz (±0.1%+5d)
Duty Cycle	0.1% to 99.9% (±2%+2d, <10kHz)
Temperature	-20°C to 150°C (±3°C+1d), 150°C to 1000°C (±3%+2d)
Battery Test	1.5V to 12V with approx. 25mA load
Diode Test	Test current ~0.4mA, open voltage ~1.5V
Continuity	Audible beep for resistance <100Ω
Bluetooth Connectivity	Compatible with Android 4.3+ and iOS 4S+ via dedicated app
Safety Rating	CAT III 1000V, CAT IV 600V
Fuse Protection	400mA/250V and 20A/250V fuses
Accessories	Test leads, thermocouple (K-type), carry case
Warranty	1 year

Frequently Asked Questions - MUL-650 Steren

How do I measure DC voltage with the MUL-650?

Connect the black test lead to COM and red to VΩHz. Turn the knob to V≈ and press SELECT if needed. Touch the probes to the circuit and read the value. Do not exceed 1000V.

How do I measure AC current?

Connect black to COM and red to μA/mA (for ≤400mA) or 20A (for up to 20A). Turn knob to μA, mA, or A position, press SELECT to choose AC. Ensure the circuit is powered and measure in series. Max input: 20A for 10 seconds.

How do I test continuity?

Set the knob to the Ω/diode/continuity position and press SELECT until the continuity symbol appears. Connect probes across the circuit; a beep sounds if resistance is <100Ω. Ensure circuit is de-energized before testing.

How do I connect the multimeter to a smartphone via Bluetooth?

Download the 'Bluetooth Multimeter' app from Google Play or App Store. Enable Bluetooth on your phone, turn on the multimeter, and open the app. It should connect automatically. Press 'Start' to begin recording data. Requires Android 4.3+ or iOS 4S+.

What does 'OL' mean on the display?

OL stands for Overload. It indicates the input exceeds the selected range. Switch to a higher range or select autorange by pressing the RANGE button. Always respect maximum ratings.

How do I replace the battery?

When the low battery symbol appears, turn off the meter and remove the test leads. Unscrew the battery compartment cover on the back, replace with a new 9V battery, observing polarity, and close the cover. Disconnect leads before opening.

What is the maximum voltage this multimeter can measure?

For DC voltage, up to 1000V. For AC voltage, up to 750V RMS. Never exceed these limits to avoid damage or injury.

How do I measure temperature?

Insert the thermocouple connectors: black to COM T- and red to T+. Turn the knob to °C. Touch the probe tip to the object and wait for a stable reading. Range: -20°C to 1000°C.

How do I measure resistance?

Connect black to COM and red to VΩHz. Turn knob to Ω position. Touch probes across the resistor or component. For high values (>1MΩ), wait a few seconds for stabilization. Ensure circuit is off and capacitors discharged.

How do I change between manual and autoranging?

Press the RANGE button while in a measurement mode. The meter switches to manual range; each press increments the range. To return to autoranging, press and hold RANGE for 2 seconds until 'AUTO' appears. Use manual range for faster readings on known signals.

USER MANUAL MUL-650 Steren

Line drawing of a digital multimeter with dial and control buttons (no text or symbols)

Multímetro Termopar Puntas

Illustration of a coiled spring with two test probes (no text or symbols)

Illustration of two types of electrical probes with coiled wires (no text or symbols)

DESCRIPCIÓN

PARTES

MODO DE USO

PRECAUCIONES DURANTE EL USO

STEREN PRODUCTO EMPACADO S.A. DE C.V.

Autopista México-Querétaro. Km 26.5 Sin número, Nave Industrial 3-A, Col. Lomas de Boulevares, Tlalnepantla de Baz, Estado de México, C.P. 54020, RFC: SPE-941215-H43

Read these manual to avoid any damage.

The instructions of these manual are for reference about the product.

There may be differences due to update.

Please check our web site www.steren.com to obtain the latest version of the instruction manual.

CAUTIONS

• Improper use of this Multimeter can cause damage, electric shock, or serious injury.
• This product is not a toy; Keep the Multimeter out of the reach of children.
• Always remove test cables before replacing batteries or fuses.
• Check the condition of the test cables and the measurer itself before operating.
• Do not measure voltages exceeding 1000V above ground; Can be risky.
• Be very careful when taking measurements if the voltages are greater than 30 VAC RMS or 60 VDC; These voltages are considered a electric shock danger.
• Always discharge the capacitors and cut off the power of the device before performing diode, resistance or continuity tests.
• To avoid damage to the Multimeter, do not exceed the maximum limits of the input values shown in the specifications.
• In case of a prolonged period of inactivity, remove the battery.
• This appliance is NOT intended for use by persons with different capacities, unless properly prepared and supervised.
• Do not use the Multimeter if the battery cover is not in place and fully closed.

NOTES:

The operation of this device is subject to the following two conditions: (1) it is possible that this device may not cause harmful interference and (2) this device must accept any interference, including interference that may cause undesired operation.

This multimeter can be connected through an application to view the measurement data from a smartphone. Please refer to the complete instruction manual on our website www.steren.com to learn how to download the application and connect via Bluetooth.

INDEX

CONTENT 3

DESCRIPTION 3

PARTS 3

SELECTION KNOB 4

SYMBOLS IN SCREEN 5

PLACING BATTERY 6

HOW TO USE 6

HOW TO CONNECT THE TEST CABLES 6

VOLTAGE MEASUREMENT WITH DIRECT CURRENT AND ALTERNATE CURRENT 7

DIRECT CURRENT AND ALTERNATE CURRENT MEASUREMENT 7

RESISTANCE MEASUREMENT 8

CAPACITANCE MEASUREMENT 8

FREQUENCY AND PERCENTAGE OF THE WORKING CYCLE MEASUREMENT ____9

TEMPERATURE MEASUREMENT 9

BATTERY TESTING 10

DIODES AND CONTINUITY TESTING 10

OTHER FUNCTIONS 11

TEST SPECIFICATIONS 12

DIRECT CURRENT VOLTAGE 12

ALTERNATE CURRENT VOLTAGE 12

DIRECT CURRENT 13

ALTERNATING CURRENT 13

RESISTANCE 13

CAPACITANCE 14

FREQUENCY 14

WORKING CYCLE 14

TEMPERATURE 14

BATTERY TESTING 15

DIODES AND CONTINUITY TESTING 15

CONTENT

DESCRIPTION

PARTS

■ SELECTION KNOB

	OFF Turn off
	V≈ Direct Current and Alternating Current Voltage
	Ω Resistance, diodes and continuity
	-1+ Capacitance
	Hz Frequency
	°C Temperature in Celsius degrees
	(EL=25mA) Battery Measurement
	μA Direct current and alternating current in micro amps
	mA Direct current and alternating current in milli amps
	A Direct current and alternating current in amps

■ SYMBOLS IN SCREEN

1	Low battery
2	Hold data
3	Relative mode
4	Working cycle measurement
5	Degrees: Celsius / Fahrenheit
6	Transistors measurement
7	Voltage unit: Volts / milli voltsCurrent unit: Micro ampere / mili ampere / ampereCapacitance unit: nano farad/ micro farad / mili farad / farad
8	Resistance unit: Kilo ohms / mega ohms / ohmsFrequency unit: Kilo hertz / mega hertz / hertz
9	Alternating current
10	Direct current
11	Continuity measurement
12	Diodes

PLACING BATTERY

Remove the screws and the battery compartment cover using a screwdriver, and insert a "9V" battery.

Be sure to place the battery polarity correctly.

If the - + symbol appears on the screen, it means that you must replace the battery.

HOW TO USE

CAUTIONS DURING USING

• To avoid the electric shock risk, do not connect the test tips if the Multimeter cover is not in place.
• The selection knob must be in the correct position for the test.
• To avoid electric shock and damage in the Multimeter, do not exceed the maximum values shown in the specifications.
• Never change the knob position of the at random during the measurement.
• To avoid electrical shock or damage in the Multimeter, do not attempt to take any voltage measurements exceeding 60 VDC and 30 VAC.
• The protective fuse must be only replaced by one of the same type and specification.

■ HOW TO CONNECT THE TEST CABLES

Insert the black cable connector into the COM terminal.

Insert the red cable connector on the 20 A, μA mA or V Ω Hz terminals.

■VOLTAGE MEASUREMENT WITH DIRECT CURRENT AND ALTERNATE CURRENT

1 Connect the black test cable in to the COM terminal and the red test cable in to the VΩ Hz terminal.
2 Turn the knob to V ≈ position, to measure the DC (Direct Current) voltage. If you want to measure the AC (Alternating current) voltage, press the "SELECT" button.
3 Tap the circuit with tips. The measurement value will be displayed.

NOTES:

1. "△" It means that you can not enter more than 1000 V; a higher voltage may be displayed, but may damage the circuit or cause an electric shock.
2. Be careful of electrical shocks when measuring high voltage.

■ DIRECT CURRENT AND ALTERNATE CURRENT MEASUREMENT

1 Connect the black test cable to the COM terminal and the red test cable in to the A mA to measure a maximum current of 400 mA. To measure a maximum current of 2 A or 20 A, connect the red wire to the 20 A terminal.
2 Turn the knob to A , mA or A position as required. If you want to measure Direct Current. If you want to measure AC (Alternating Current), press the "SELECT" button.
3 Tap the circuit with tips. The measurement value will be displayed.

NOTES:

1. If "OL" appears in the display, means the input value exceeds the selected range.
2. "△" means that the mA maximum current of the plug is 400 mA and the maximum current 20 A, if the measurement is over 400 mA it will be protected by the fuse but if the current is greater than 20 A the fuse will be burn

■RESISTANCE MEASUREMENT

1 Connect the black test cable in to the COM terminal and the red test cable in to the VΩ Hz terminal.
2 Turn the knob to the ^ position.
3 Tap the circuit with tips. The measurement value will be displayed.

NOTES:

1. If you measure resistors greater than 1 MΩ, the Meter may take a few seconds to obtain a stable reading.
2. When the terminal is not connected, it means, in open circuit, the "OL" icon will be displayed indicating that it is over the range.
3. Make sure that the circuits are out of power and capacitors are fully discharged to prevent electrical shock or damage to the device.

CAPACITY MEASUREMENT

1 Connect the black test cable in to the COM terminal and the red test cable in to the V Ω Hz terminal.
2 Turn the knob to the +1 position.
3 Tap the circuit with tips or wire that you want to check. The measurement value will be displayed.

NOTE:

Make sure that the circuits are out of power and the capacitors are fully discharged to prevent electric shocks or damages to the device.

■ FREQUENCY AND PERCENTAGE OF THE WORKING CYCLE MEASUREMENT

1 Connect the black test cable in to the COM terminal and the red test cable in to the VΩ Hz terminal.
2 Turn the knob to Hz position.
3 Press the "Hz / %" button or choose the frequency test or the percentage of the working cycle.
4 Tap the circuit with tips. The measurement value will be displayed.

■ TEMPERATURE MEASUREMENT

1 Insert the black thermocouple connector into the T-terminal and insert the red connector into the T+ terminal.
2 Turn the knob to the °C position.
3 Tap with the tip the piece whose temperature you want to measure; Hold the contact until the reading stabilizes.

BATTERY TESTING

1 Connect the black test cable in to the COM terminal and the red test lead in to the terminal
2 Turn the knob to the (1L=25mA) position.
3 Tap the circuit with tips. The measurement value will be displayed.

■ DIODES AND CONTINUITY TESTING

1 Connect the black test cable in to the COM terminal and the red test cable in to the VΩ Hz terminal.
2 Turn the knob to position.
3 Press the "SELECT" button to select diode or continuity measurement.
4 To measure diodes connect the tips to the semiconductor component: the red to the anode and the black to the cathode.
To measure continuity, tap with tips the circuit or wire that you want to check. The measurement value will be displayed.

NOTE:

Make sure that the circuits are out of power and the capacitors are fully discharged to prevent electric shocks or damages to the device.

OTHER FUNCTIONS

Hold data	After performing a measurement press once to hold the reading on the screen.
Change range	Press to select between auto or manual range.
Relative mode	After taking a measurement (reference value) press REL. Then take a second measurement.The displayed value is the difference between the two values.
Lighting sensor	The light on the screen will automatically turn on in low light conditions.

TEST SPECIFICATIONS

■ DIRECT CURRENT VOLTAGE

RANGE RESOLUTION ACCURACY
400 mV 0.1 mV		±(0.5% of reading + 2 digits)
4 V 1 mV
40 V	10 mV
400 V	100 mV
1 000 V	1 V	±(0.8% of reading + 2 digits)

Impedance: 10 MΩ

Overload protection: 250 V DC or AC rms of 400 mV range, 1 000 DC or 750 V AC rms for other ranges

■ ALTERNATING CURRENT VOLTAGE

RANGE RESOLUTION ACCURACY
400 mV 0.1 mV		±(1.2 % of reading + 3 digits)
4 V 1 mV		±(0.8 % of reading + 3 digits)
40 V	10 mV
400 V	100 mV
750 V	1 V	±(1.2 % of reading + 3 digits)

The 400 mV range only select it with the button "RANGE".

Impedance: 10 MΩ, more than 100 MΩ over the 400 mV range

Overload protection: 250 V DC or AC rms of 400 mV range, 1 000 DC or 750 V AC rms for other ranges

Frequency range: 40 to 400 Hz

Response: Average, calibrated in sine wave rms

DIRECT CURRENT

RANGE RESOLUTION		ACCURACY
400 μA 0.1μA		±(1.2% of reading + 2 digits)
4 000 μA 1μA
40 mA	10 μA
400 mA	100 μA
4 A	1 mA	±(2.0% of reading + 3 digits)
20 A	10 mA

Overload protection: 400 mA / 250 V Fuse
F-20 A /250 V Fuse, 20 A up to 10 seconds

■ALTERNATING CURRENT

RANGE RESOLUTION		ACCURACY
400 μA 0.1μA		±(1.5 % of reading + 3 digits)
4 000 μA 1μA
40 mA	10 μA
400 mA	100 μA
4 A	1 mA	±(2.5 % of reading + 5 digits)
20 A	10 mA

Overload protection: 400 mA / 250 V Fuse
Fusible F-20 A / 250 V, 20 A up to 10 seconds
Frequency range: 40 up to 400 Hz

RESISTANCE

RANGE RESOLUTION		ACCURACY
400 Ω 0.1Ω		±(1.0 % of reading + 3 digits)
4 kΩ 1Ω		±(1.0 % of reading + 2 digits)
40 kΩ	10 Ω
400 kΩ	100 Ω
4 MΩ	1 kΩ
40 MΩ	10 kΩ	±(1.5 % of reading + 3 digits)

Overload protection: 250 V DC or AC rms

CAPACITANCE

RANGE RESOLUTION		ACCURACY
51.2 nF 10 pF		±(3.0 % of reading + 10 digits)
512 nF 100 pF		±(2.5 % of reading + 5 digits)
5.12 μF	1 nF
51.2 μF	10 nF
4 100 μF	100 nF	±(5.0 % of reading + 10 digits)

Overload protection: 250 V DC or AC rms

FREQUENCY

RANGE RESOLUTION		ACCURACY
5.12 Hz 0.001 Hz		±(0.1% of reading + 5 digits)
51.2 Hz 0.01 Hz
512 Hz	0.1 Hz
5,12 kHz	1 Hz
51.2 kHz	10 Hz
512 kHz 100 Hz
5.12 MHz	1 kHz

Sensitivity: sine wave 0.6 V rms (5.12 MHz: 1.5 V rms)
Overload protection: 250 V DC or AC rms

WORKING CYCLE

0.1% \~ 99.9% ± (2.0% of reading + 2 digits), Frequency less than 10 kHz

Sensitivity: sine wave 0.6 V rms

Overload protection: 250 V DC or AC rms

TEMPERATURE

			RESOLUTIONRANGE ACCURA
°C 1 °C	-20 150 °Cto	±(3 °C + 1 digit)
	150 to 1 000 °C	±(3 % of reading + 2 digits)

BATTERY TESTING

		TEST CONDITIONRANGE ACCURA
		Charging current: Approx. 25 mA±(50% of

Battery voltage range: 1.5 V \~ 12 V

Overload protection: 400 mA / 250 V Fuse

■DIODES AND CONTINUITY TESTING

		TEST CONDITIONRANGE DESCR
	Approximate diode voltage reading	Direct current approx. 0.4 mAInverted voltage approx. 1.5 V
	A buzz will sound if resistance is less than 100 Ω	Open circuit voltage approx. 0.5 V

Battery voltage range: 1.5 V \~ 12 V

Overload protection: 250 V DC or AC rms

The Multimeter has the serial data output function. It can be connected to the mobile phone by Bluetooth, so the data of the multimeter can be recorded, analyzed, and processed by the mobile phone APP. Before using this feature, you must install the mobile phone APP. Download it in PLAYSTORE for android and in Appstore for iphone.

graph LR
    A["Android robot"] --> B["Google Play"]
    B --> C["Bluetooth Multimeter"]
    C --> D["Android App"]

NOTE: The mobile phone APP can be installed on android system 4.30 or higher.

graph LR
    A["App Store"] --> B["Download on the App Store"]
    B --> C["Bluetooth Multimeter"]
    C --> D["iPhone App"]

NOTE: The mobile phone APP can be installed on iOS 4S or higher.

1 Make sure that the mobile phone application has been installed correctly before any measurement.
2 Open the Bluetooth of the mobile phone and perform the application to enter in the main interface.

3 Turn on the multimeter, it will connect to the mobile phone automatically, when the "Iniciar" key changes to green color, click to measure and view synchronized data or graphics.

4 The MAX or MIN value and corresponding time will be displayed in the mobile phone APP, and the average value in a period of time from the start measurement will also be displayed.
5 Press "Reiniciar" to reset the measurement, the old data will be erased and data recording will resume. Press the "Detener" key to stop the connection.

Datos: to view data and time.

Gráfica: to view graphic.

Guardar: to save data or graphic.

Inicio: to return to the main interface.

To view saved files, search folder with the specified name when saving

To change the data saving time go to "Ajustes" and click on Tasa de datos

A slide bar will appear and will indicate how many measurements are saved per minute

Example: 60 per minute

Input: 9 V --- (square battery)

DC voltage (V): 400 mV / 4 V / 40 V / 400 V ±(0.5%+2d) / 1 000 V ±(0.8%+2d)

AC voltage (V) True-RMS: 4 V / 40 V / 400 V ±(0.8%+3d) / 750 V ±(1.2%+3d)

DC current (A): 400 uA / 4 000 uA / 40 mA / 400 mA ±(1.2%+2d)

DC current (A): 4 A / 20 A ±(2%+3d)

AC current (A): 400 uA / 4 000 uA / 40 mA / 400 mA ±(1.5%+3d)

AC current (A): 4 A / 20 A ±(2.5%+5d)

Resistance (Ω): 400 ±(1%+3d) / 4 K / 40 K / 400 K / 4 M ±(1%+2d) / 40 M ±(1.5%+3d)

Capacitance: 51.2 nF ±(3%+10d) / 512 nF / 5.12 uF / 51.2 uF ±(2.5%+5d) / 100 uF ±(5%+10d)

Frequency (Hz): 5.12 Hz / 51.2 Hz / 512 Hz / 5.12 kHz / 512 kHz / 5.12 MHz ±(0.1%+5d)

Temperature: -20 to 150°C ±(3°C+1d) / 150 to 1 000 °C ±(3%+2d)

Operating temperature: 0 - 40 °C

Storing temperature: -20 to 60°C

Consumption: 0.1 mW/h

Stand by power consumption: not applicable

Product: Bluetooth professional multimeter

Part number: MUL-650

Brand: Steren

WARRANTY

This Steren product is warranted under normal usage against defects in workmanship and materials to the original purchaser for one year on the other parts from the date of purchase.

CONDITIONS

1. This warranty card with all the required information, invoice or purchase ticket, product box or package, and product, must be presented when warranty service is required.
2. If the product is in the warranty time, the company will repair it free of charge. The supplier will pay for transportation charges.
3. The repairing time will not exceed 30 natural days, from the day the claim was received.
4. Steren sell parts, components, consumables and accessories to customer, as well as warranty service, at any of the addresses mentioned later.

THIS WARRANTY IS VOID IN THE NEXT CASES:

If the product has been damaged by an accident, acts of God, mishandling, leaky batteries, failure to follow enclosed instructions, improper repair by unauthorized personnel, improper safe keeping, among others.

a) The consumer can also claim the warranty service in the purchase establishment.
b) If you lose the warranty card, we can reissue it, if you show the invoice or purchase ticket.

ELECTRÓNICA STEREN S.A. DE C.V.

Biólogo Maximino Martínez No. 3408, San Salvador Xochimanca, Del. Azcapotzalco Ciudad de México 02870, RFC: EST850628-K51

STEREN PRODUCTO EMPACADO S.A. DE C.V.

Autopista México-Querétaro. Km 26.5 Sin número, Nave Industrial 3-A, Col. Lomas de Boulevares, Tlalnepantla de Baz, Estado de México, C.P. 54020, RFC: SPE-941215-H43

RETAILER INFORMATION

Name of the retailer

Address

Serial number

Product

In case your product fails or have questions, please contact your nearest dealer.

If you are in Mexico, please call to our Call Center.

Call Center 01 800 500 9000

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www.steren.com